There is no denying that the Subaru Impreza 2.2 Liter and 2.5 Liter is a naturally aspirated wonder of a car. There is always room for improvement though. The OEM stock exhaust restricts the flow from the engine, causing a bottle neck trying to get out, significantly limiting the potential of the Impreza. There is a simple solution to that problem, and it is called the Tsudo Impreza 2.5 RS N1 JDM Catback Exhaust. It is manufactured from the highest quality 100% T-304 stainless steel to prevent corrosion and increase durability. That stainless steel is then CNC machine mandrel bent and given a perforated core. The result of this is a tuned piping that has a smooth free flowing system to give it a straight through, unrestricted path out of the system. This in turn improves horsepower, torque, and throttle response. The performance goes one step further by weighing significantly less than the OEM stock system. When you turn it on you can hear the power waiting under the hood in the form of a low, deep tone. You can hear as your car climbs through the rpms the power that was hidden before.